package com.itheima.reggie.filter;


import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查是否登录，否则跳转到登录页面
 */
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    public static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

//        1、获取本次请求的URI
        HttpServletRequest request=(HttpServletRequest) servletRequest;
        HttpServletResponse response=(HttpServletResponse) servletResponse;
        log.info("拦截到请求：{}",request.getRequestURI());
//        2、判断本次请求是否需要处理
        String[] urls=new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/login",
                "/user/sendMsg"
        };
        boolean check = check(urls, request.getRequestURI());



//        3、如果不需要处理，则直接放行
        if (check){
            log.info("本次请求{}不需要处理",request.getRequestURI());
            filterChain.doFilter(request,response);
            return;
        }
//        4-1、判断登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("employee")!=null){
            log.info("用户已经登录，用户id为：{}",request.getSession().getAttribute("employee"));

            /**
             * 设置id到线程中去
             */
            Long empId=(Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);


            filterChain.doFilter(request,response);
            return;
        }
        //        4-2、判断移动端登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("user")!=null){
            log.info("用户已经登录，用户id为：{}",request.getSession().getAttribute("user"));

            /**
             * 设置id到线程中去
             */
            Long userId=(Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);


            filterChain.doFilter(request,response);
            return;
        }

//        5、如果未登录则返回未登录结果 request.js 响应拦截器
        log.info("用户未登录");
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;


    }

    /**
     *路径匹配 检查是否需要放行
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match){
                return true;
            }
        }
        return false;
    }
}
